Night before a big day (3)

I believe the answer is:

eve

'night before a big day' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eve that I've seen before include "Brink" , "Lady first appearing" , "One from Genesis" , "Adam & - -" , "Day before a festival" .)

I've seen this clue in the New York Times and The Wall Street Journal.

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